At any time of the year, if you have a year-round calving operation. For those on set calving schedules, calving ranges from mid-winter to early spring (grass-fed operations calve around mid- to late spring) and/or around autumn, primarily.
Anytime.
This question is impossible to answer since we have no idea of location where these calves are born, location as in country or state/province.
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A cow can deliver one calf at a time.
If it is a group of calves born from different mothers than you call them a herd of calves or a group of calves. If it is two calves born at the same time from the same mother than they are twins, just the same as human offspring would be called.
A female moose usually calves once per year, and has one calf at a time, twins are rare.
Manatees are at least a year old when they have calves.
Only once a year.
two calves were born yesterday.
No. Blue eyes in calves is a very rare genetic occurrence. Almost all calves born into this world are born with brown eyes, not blue.
Always one. I've never heard of two calves being born at the same time; if there were twins, it's always one after the other, as the cow's pelvis is only wide enough to allow one calf through at a time.
Depends on the breed. Most calves can gain between 600 and 800 lbs in their first year.